Abstract: Apparatus and methods are disclosed for rapidly counteracting a transient low-pressure condition, that can occur intermittently in the exhaust section of a power plant or other such industrial facility upstream of exhaust fans as a result of an event that interrupts the generation and/or flow of exhaust gases, using jet nozzles disposed in the exhaust section and connected to a source of pressurized air or other suitable momentum material. By orienting the jet nozzles in a direction generally opposite to the flow of exhaust gas and actuating the system to release a burst of compressed air, for example in the event of a power plant interruption, the low-pressure condition can be ameliorated preventing damage to the exhaust section.

Abstract: Methods and apparatus are disclosed for alleviating or modulating periodic sudden pressure changes in a gas ducting system by fluidically connecting a gas duct to one side of a partitioned, liquid-filled reservoir, the other side of which comprises a stack conduit venting to the ambient environment. With this configuration, elevated gas duct pressure displaces liquid from the reservoir up into the stack conduit to a height above the reservoir and thereby helps to alleviate the elevated duct or system pressure, without leaking process gases from the duct through the reservoir and into the environment. Reduced gas duct pressures or vacuum-like conditions in the duct draws ambient air through the stack conduit and the reservoir and then into the duct to help alleviate the reduced duct or system pressure.

Abstract: Apparatus and methods are disclosed for rapidly counteracting a transient low-pressure condition, that can occur intermittently in the exhaust section of a power plant or other such industrial facility upstream of exhaust fans as a result of an event that interrupts the generation and/or flow of exhaust gases, using jet nozzles disposed in the exhaust section and connected to a source of pressurized air or other suitable momentum material. By orienting the jet nozzles in a direction generally opposite to the flow of exhaust gas and actuating the system to release a burst of compressed air, for example in the event of a power plant interruption, the low-pressure condition can be ameliorated preventing damage to the exhaust section.